To solve the issue with Gmail SMTP plugin, we added back compatibility with Google SDK 1.x. to our WP-Stateless plugin. But, suddenly you launched new version of plugin which contains cut version of latest Google SDK. And… it just broke our plugin again….

you should not load Google SDK on every page load ( on plugin initialization ). In other case, you will face with another conflicts: when other third-party plugins are using legacy Google SDK ( < v2.0 ).

It also belongs to other Google SDK versions, since you’re using cut version of SDK…. And, even more fact, Google SDK 2.0.0 has conflicts with Google SDK 2.2.0… So, I’m absolutely sure you will get much more support topics now, regarding conflicts with other plugins which also use Google SDK.

I believe, that the problem is not a version of Google SDK, but how you’re initializing it. To prevent the most potential issues with other plugins, you just needed to start loading your Google SDK ONLY when it’s really needed, but not on every plugin’s initialization…